Alamos Gold Reports Mineral Reserves and Resources for the Year-Ended 2025

Rhea-AI Summary

Alamos Gold (TSX:AGI, NYSE:AGI) reported year-end 2025 Mineral Reserves and Resources showing material growth: Proven and Probable Reserves +32% to 15.9 Moz at 1.87 g/t Au, driven by a 125% increase at Island Gold to 5.1 Moz (15.1 mt at 10.61 g/t).

Global Measured & Indicated Resources rose 6% to 5.5 Moz; Inferred Resources fell 63% to 2.0 Moz. Alamos set a record $97M 2026 exploration budget and announced an Island Gold District expansion to 20,000 tpd targeting 534,000 oz/year at $1,025/oz AISC post-2028.

Positive

• Proven & Probable Reserves +32% to 15.9 million ounces
• Island Gold Reserves +125% to 5.1 million ounces at 10.61 g/t
• Record exploration budget of $97 million for 2026 (+37%)
• Planned Island Gold expansion to 20,000 tpd targeting 534,000 oz/year at $1,025/oz AISC

Negative

• Inferred Mineral Resources -63% to 2.0 million ounces
• Mulatos Mineral Reserves decreased 14% to 1.2 million ounces (depletion at La Yaqui Grande)
• Island Gold grade decreased 7% to 10.61 g/t Au (mix of additions)

Key Figures

Share price move: 7.25% Global P&P reserves: 15.9 million oz Reserve growth: 32% +5 more

8 metrics

Share price move 7.25% Price change on day of 2025 reserve and resource update

Global P&P reserves 15.9 million oz Global Proven and Probable Mineral Reserves as of Dec 31, 2025

Reserve growth 32% Increase in global Proven and Probable Mineral Reserves vs 2024

Island Gold reserves 5.1 million oz at 10.61 g/t Au Island Gold Proven and Probable Mineral Reserves 2025

Magino reserves 3.1 million oz at 0.86 g/t Au Magino Proven and Probable Mineral Reserves 2025

Gold price for reserves $1,800/oz Assumption used for estimating Mineral Reserves in 2025

Gold price for resources $2,000/oz Assumption used for estimating Mineral Resources in 2025

2026 exploration budget $97 million Record global exploration budget for 2026, up 37% from 2025

Market Reality Check

Price: $45.25 Vol: Volume 4,824,830 is sligh...

normal vol

$45.25 Last Close

Volume Volume 4,824,830 is slightly below the 20‑day average of 5,153,753 (relative volume 0.94). normal

Technical Price 43.31 is trading above the 200‑day MA of 32.02, indicating a pre‑existing uptrend into this reserve update.

Peers on Argus

AGI is up 7.25% while peers show mixed moves: PAAS -0.3%, RGLD -0.05%, KGC +1.36...

AGI is up 7.25% while peers show mixed moves: PAAS -0.3%, RGLD -0.05%, KGC +1.36%, AU +1.36%, CDE +1.73%. This points to a stock‑specific reaction to the reserve update rather than a broad gold‑sector move.

Common Catalyst Another gold peer, CDE, also reported year‑end mineral reserves and resources today, suggesting an industry reporting window, but AGI’s stronger move appears company‑specific.

Historical Context

5 past events · Latest: Feb 04 (Positive)

Pattern 5 events

Date	Event	Sentiment	Move	Catalyst
Feb 04	Three-year guidance	Positive	+5.7%	Updated 2026–2028 guidance showing 46% production growth and lower AISC.
Feb 03	Expansion study	Positive	+4.0%	Island Gold District expansion to 20,000 tpd with strong NPV and IRR metrics.
Feb 02	Exploration results	Positive	-0.2%	High‑grade Island Gold and Cline‑Pick drilling including 178 g/t Au over 3.54 m.
Jan 30	Exploration update	Positive	-12.4%	Higher‑grade hanging wall mineralization near infrastructure at Young‑Davidson.
Jan 28	Exploration update	Positive	+1.8%	Lynn Lake reserve growth and high‑grade intercepts plus Qiqavik district potential.

Pattern Detected

Recent positive growth and expansion news has often led to positive price reactions, though some exploration updates saw negative or muted moves, indicating occasional divergences.

Recent Company History

Over recent weeks, Alamos Gold has released a series of growth‑oriented updates. On Jan 28, exploration at Lynn Lake and Qiqavik highlighted high‑grade upside, followed by higher‑grade zones at Young‑Davidson on Jan 30. Early February brought Island Gold exploration results (Feb 2), a major district expansion study (Feb 3), and three‑year guidance with substantial production growth on Feb 4. Today’s reserve and resource increase builds directly on that exploration and expansion narrative.

Market Pulse Summary

This announcement highlights substantial reserve and resource growth, with global Proven and Probabl...

Analysis

This announcement highlights substantial reserve and resource growth, with global Proven and Probable Mineral Reserves reaching 15.9 million oz, up 32%, and Island Gold reserves climbing to 5.1 million oz at 10.61 g/t Au. It builds on recent expansion and exploration updates across Island Gold, Magino, Young‑Davidson and Lynn Lake. Investors may focus on how the record $97 million 2026 exploration budget, updated gold price assumptions, and future technical studies translate into sustainable production, costs, and mine life.

Key Terms

proven and probable mineral reserves, measured and indicated mineral resources, inferred mineral resources, all-in sustaining costs, +2 more

6 terms

proven and probable mineral reserves technical

"Proven and Probable Mineral Reserves increased 32% to 15.9 million ounces..."

Proven and probable mineral reserves are the amounts of a mine’s minerals that engineers estimate can be economically extracted with current technology and market conditions; “proven” denotes high-confidence quantities based on detailed testing, while “probable” denotes lower-confidence but still likely quantities. For investors, these categories act like a company’s usable inventory — they underpin production forecasts, revenue estimates and lending or valuation decisions, and signal how certain future cash flows from the resource are.

measured and indicated mineral resources technical

"Global Measured and Indicated Mineral Resources increased 6% to 5.5 million ounces..."

Measured and indicated mineral resources are estimates of how much ore and valuable material are present in a deposit, based on sampling, drilling and geological study. “Measured” denotes a high level of confidence in the quantity and quality, while “indicated” means there is reasonable but lower confidence; together they give investors a clearer picture of a project's size, potential revenue and risk—like using multiple spoonfuls to judge how much soup is in a pot before committing to cook it or buy it.

inferred mineral resources technical

"Global Inferred Mineral Resources decreased 63% to 2.0 million ounces of gold..."

An inferred mineral resource is an estimate of the quantity and grade of minerals in the ground based on limited sampling and geological information, where confidence is low and continuity is uncertain. For investors it signals potential value but also higher risk—like a rough sketch of a hidden treasure that requires much more exploration and testing before you can reliably judge its size or economic worth.

all-in sustaining costs financial

"average annual production is expected to increase to 534,000 ounces... at mine-site all-in sustaining costs (“AISC”) of $1,025 per ounce."

All-in sustaining costs (AISC) is a per-unit measure used mainly in the mining sector that captures the full ongoing cost to produce a unit of metal, including operating expenses, sustaining capital (maintenance of current operations), and a share of corporate overhead and site-level costs. Investors use AISC to judge whether production generates real profit and sustainable cash flow—think of it as the total monthly household cost to keep a home running, not just the utility bill.

tonnes per day technical

"supporting an expansion of the operation to 20,000 tonnes per day (“tpd”)."

Tonnes per day is a measure of how much material — such as minerals, oil, chemicals, or waste — is processed, produced or moved each day, expressed in metric tons. Investors use it like the speedometer of an operation: higher tonnes-per-day capacity usually means more potential sales, revenue and economies of scale, while declines or bottlenecks can signal production problems and affect a company’s cash flow and valuation.

underground exploration drift technical

"To support the underground exploration program, 1,090 m of underground exploration drift development is planned..."

An underground exploration drift is a horizontal tunnel dug into rock to reach, examine and sample a mineral deposit without mining it fully; think of it as a hallway cut into the ground to look into the walls and take measurements. For investors, drifts show how quickly and cheaply a company can access and test potential ore, reducing uncertainty about the size, quality and cost of extracting a resource and therefore affecting project value and financing risk.

AI-generated analysis. Not financial advice.

Global Mineral Reserves Increase 32% with Grades also Increasing 5%, Driven by 125% Growth in High-Grade Mineral Reserves at Island Gold

All amounts are in United States dollars, unless otherwise stated.

TORONTO, Feb. 17, 2026 (GLOBE NEWSWIRE) -- Alamos Gold Inc. (TSX:AGI; NYSE:AGI) (“Alamos” or the “Company”) today reported its updated Mineral Reserves and Resources as of December 31, 2025. For a detailed summary by asset, refer to the tables below.

Highlights

• Global Proven and Probable Mineral Reserves increased 32% to 15.9 million ounces of gold (265 million tonnes (“mt”)) with grades also increasing 5% to 1.87 grams per tonne of gold (“g/t Au”). This was driven by the successful conversion of a large portion of the Island Gold District’s Mineral Resource base into Mineral Reserves
  • Island Gold’s Mineral Reserves more than doubled, increasing 125% to 5.1 million ounces (15.1 mt grading 10.61 g/t Au), reflecting the conversion of existing and newly defined Mineral Resources to Mineral Reserves
  • Magino’s Mineral Reserves increased 56% to 3.1 million ounces (113 mt grading 0.86 g/t Au), primarily reflecting the successful conversion of Mineral Resources to Mineral Reserves
• Global Measured and Indicated Mineral Resources increased 6% to 5.5 million ounces of gold (119 mt grading 1.44 g/t Au), driven by additions at Young-Davidson, Lynn Lake and Mulatos, more than offsetting Mineral Resource conversion at Magino
• Global Inferred Mineral Resources decreased 63% to 2.0 million ounces of gold (35.0 mt grading 1.82 g/t Au), reflecting the successful conversion of Inferred Mineral Resources at both Island Gold and Magino to Mineral Reserves
• Gold price assumption of $1,800 per ounce used for estimating Mineral Reserves and $2,000 per ounce for estimating Mineral Resources, up from $1,600 and $1,800 per ounce, respectively, in 2024, reflecting the significantly higher gold price environment. Both remain conservative relative to the three-year trailing average gold price of approximately $2,592 per ounce
• Record global exploration budget of $97 million in 2026, up 37% from the $71 million spent in 2025 with expanded programs at the Island Gold District, Young-Davidson and Lynn Lake. The expanded exploration budget is underpinned by broad-based success across the Company’s asset base in 2025
  
  

“Our long-term investment in exploration continues to create value with another substantial increase in Mineral Reserves to 16 million ounces, and at higher grades. The majority of this growth was within the Island Gold District, with the larger Mineral Reserve serving as the foundation for the Island Gold District Expansion announced earlier this month. This marks the seventh consecutive year of growth, with grades increasing 24% over that time frame as our Reserves continue to grow in both size and quality. We also demonstrated significant exploration success across our asset base over the past year. We expect this ongoing success will serve as the foundation for further Mineral Reserve and Resource growth in the years ahead with a record exploration budget of nearly $100 million planned for 2026,” said John A. McCluskey, President and Chief Executive Officer.   

Proven and Probable Gold Mineral Reserves1
	2025				2024			% Change
	Tonnes	Grade		Ounces	Tonnes	Grade	Ounces	Tonnes	Grade	Ounces
	(000’s)	(g/t Au)		(000’s)	(000’s)	(g/t Au)	(000’s)	(000’s)	(g/t Au)	(000’s)
Island Gold	15,072		10.61	5,141	6,232	11.40	2,285	142%	-7%	125%
Magino	113,141		0.86	3,141	68,400	0.91	2,008	65%	-5%	56%
Total Island Gold District	128,212		2.01	8,282	74,632	1.79	4,293	72%	12%	93%
Young-Davidson	42,184		2.20	2,983	41,756	2.26	3,030	1%	-3%	-2%
La Yaqui Grande	3,293		1.35	143	7,710	1.34	331	-57%	1%	-57%
Puerto Del Aire	6,050		5.45	1,060	6,050	5.45	1,060	-	-	-
Total Mulatos	9,343		4.00	1,203	13,760	3.14	1,391	-32%	27%	-14%
MacLellan	41,158		1.31	1,732	39,379	1.35	1,711	5%	-3%	1%
Gordon	10,440		2.02	679	10,006	2.09	671	4%	-3%	1%
Burnt Timber	13,934		1.00	449	14,352	1.02	469	-3%	-1%	-4%
Linkwood	19,906		0.90	576	16,318	0.90	472	22%	0%	22%
Total Lynn Lake	85,438		1.25	3,436	80,056	1.29	3,322	7%	-3%	3%
Alamos – Total	265,176		1.87	15,903	210,203	1.78	12,036	26%	5%	32%
Measured and Indicated Gold Mineral Resources (exclusive of Mineral Reserves)1
Island Gold	2,093	8.77		590	2,133	8.76	601	-2%	0%	-2%
Magino	56,798	0.79		1,439	62,689	0.94	1,905	-9%	-17%	-24%
Total Island Gold District	58,891	1.07		2,029	64,823	1.20	2,506	-9%	-11%	-19%
Young-Davidson – Surface	1,739	1.24		69	1,739	1.24	69	-	-	-
Young-Davidson – Underground	12,970	3.40		1,420	11,114	3.13	1,117	17%	9%	27%
Total Young-Davidson	14,708	3.15		1,489	12,852	2.87	1,186	14%	10%	26%
Golden Arrow	6,442	1.19		246	6,442	1.19	246	-	-	-
Mulatos Mine	8,190	0.96		252	6,772	0.98	214	21%	-3%	18%
La Yaqui Grande	1,462	0.81		38	1,523	0.78	38	-4%	4%	0%
Puerto Del Aire	2,403	3.49		269	2,403	3.49	269	-	-	-
Cerro Pelon	1,391	4.28		192	720	4.49	104	93%	-5%	84%
Carricito	3,356	0.74		80	1,355	0.83	36	148%	-10%	122%
Total Mulatos	16,802	1.54		831	12,772	1.61	661	32%	-4%	26%
Lynn Lake	21,735	1.27		885	16,189	1.13	587	34%	12%	51%
Alamos – Total	118,578	1.44		5,480	113,077	1.43	5,186	5%	1%	6%
Inferred Gold Mineral Resources1
Island Gold	2,867	11.51		1,061	7,106	16.52	3,774	-60%	-30%	-72%
Magino	14,045	0.75		338	40,383	0.91	1,177	-65%	-18%	-71%
Total Island Gold District	16,912	2.57		1,398	47,488	3.24	4,950	-64%	-21%	-72%
Young-Davidson – Surface	31	0.99		1	31	0.99	1	-	-	-
Young-Davidson – Underground	1,382	3.73		166	1,880	3.25	197	-26%	15%	-16%
Total Young-Davidson	1,413	3.67		167	1,911	3.22	198	-26%	14%	-16%
Golden Arrow	2,028	1.07		70	2,028	1.07	70	-	-	-
Mulatos Mine	761	0.91		22	641	0.91	19	19%	-1%	16%
La Yaqui Grande	41	2.17		3	74	1.74	4	-45%	25%	-25%
Puerto Del Aire	281	4.07		37	281	4.07	37	-	-	-
Cerro Pelon	83	3.99		11	-	-	-	-	-	-
Carricito	1,499	0.60		29	900	0.74	22	67%	-18%	32%
Total Mulatos	2,665	1.18		101	1,896	1.34	82	41%	-12%	24%
Lynn Lake	11,939	0.80		308	5,682	0.94	171	110%	-14%	80%
Alamos – Total	34,958	1.82		2,044	59,005	2.88	5,471	-41%	-37%	-63%

^{1. The Türkiye assets and Quartz Mountain were sold in 2025 and have been excluded from the 2024 year-end Mineral Reserves and Mineral Resources for comparative reporting purposes.}

Mineral Reserves
Global Proven and Probable Mineral Reserves totalled 15.9 million ounces of gold as of December 31, 2025, a 32% increase from 12.0 million ounces at the end of 2024. The increase reflects the conversion of Mineral Resources into Mineral Reserves at both Island Gold and Magino. Grades also increased 5% to 1.87 g/t Au reflecting the significant increase and higher proportion of high-grade underground Mineral Reserves from the Island Gold District.

The strong growth in Mineral Reserves more than outpaced mining depletion of 594,000 ounces in 2025. This marked the seventh consecutive year Mineral Reserves have increased for a cumulative increase of 64%, with grades also increasing 24% over that time frame.

Island Gold was the largest driver of the increase with underground Mineral Reserves increasing 125% to 5.1 million ounces, net of depletion, with grades averaging 10.61 g/t Au. This marked the 13^th consecutive year of growth at the operation. The key driver of the increase was the conversion of high-grade Mineral Resources in the lower portion of Island East. Mineral Reserves in this high-grade block have grown to now total 1.6 million ounces grading 15.31 g/t Au (3.3 mt). With the main structure open laterally and at depth, and a growing number of high-grade zones being defined in the hanging wall and footwall, there is excellent potential for this long-term pace of growth to continue.

Magino’s open pit Mineral Reserves also increased 56% to 3.1 million ounces, with grades averaging 0.86 g/t Au. As with at Island Gold, the majority of the increase was through the successful conversion of Mineral Resources to Mineral Reserves.

Young-Davidson’s Mineral Reserves were largely unchanged at 3.0 million ounces grading 2.20 g/t Au, with additions to Mineral Reserves offsetting the majority of depletion. Mulatos Mineral Reserves decreased to 1.2 million ounces grading 4.00 g/t Au reflecting depletion at La Yaqui Grande. With limited drilling completed at PDA, Mineral Reserves at the higher-grade underground project were unchanged. Combined Mineral Reserves at the Lynn Lake project increased slightly to 3.4 million ounces grading 1.25 g/t Au, driven by additions at the Linkwood satellite deposit.

A detailed summary of Proven and Probable Mineral Reserves as of December 31, 2025, is presented in Table 1 at the end of this press release.

Mineral Resources
Global Measured and Indicated Mineral Resources (exclusive of Mineral Reserves) increased 6% to 5.5 million ounces, at slightly higher grades of 1.44 g/t Au, as of December 31, 2025. Global Inferred Mineral Resources decreased 63% to 2.0 million ounces with grades decreasing 37% to 1.82 g/t Au, as of December 31, 2025. The decrease in Inferred Mineral Resources and grades reflects the successful conversion of higher-grade underground Mineral Resources at the Island Gold District to Mineral Reserves.

Detailed summaries of the Company’s Measured and Indicated Mineral Resources and Inferred Mineral Resources as of December 31, 2025, are presented in Tables 3 and 4, respectively, at the end of this press release.

Island Gold District
Island Gold underground
Island Gold’s long-term track record of growth continued in 2025 with total Mineral Reserves and Resources increasing 2% across all categories to 6.8 million ounces, net of depletion. This represents the 10^th consecutive year total Mineral Reserves and Resources have increased, a significant achievement given the limited exploration drilling completed over the past year, with the focus on Mineral Resource conversion. Inclusive of mining depletion, over eight million ounces have been discovered to date at Island Gold as it continues to demonstrate itself as one of the highest-grade and fastest growing deposits in the world.

The primary focus of the 2025 exploration program at Island Gold was on delineation drilling to convert the large Inferred Mineral Resource base to Mineral Reserves. The program was highly successful with Mineral Reserves increasing 125% to 5.1 million ounces, net of mining depletion, marking the 13^th consecutive year of growth. This significantly outpaced mining depletion, which totaled 166,000 ounces grading 11.35 g/t Au in 2025.

Grades decreased 7% to 10.61 g/t Au reflecting a mix of high-grade and relatively lower grade additions across the main structure, and within multiple hanging wall and footwall zones. One of the largest drivers of the increase in Mineral Reserves was the lower portion of Island East, an area that now contains 1.6 million ounces grading 15.31 g/t Au (3.3 mt; see Figure 2). This represents one of the highest-grade portions of the deposit, contains some of the deepest and highest-grade intercepts drilled to date, and remains open laterally and at depth, highlighting the significant potential for further growth.

Measured and Indicated Mineral Resources decreased 11,000 ounces to 590,000 ounces with grades unchanged at 8.77 g/t Au. Inferred Mineral Resources decreased 72% to 1.1 million ounces, with grades decreasing to 11.51 g/t Au, reflecting the conversion of significantly higher grade Mineral Resources in Island East to Mineral Reserves. Through further drilling, the majority of these Mineral Resources are expected to convert to Mineral Reserves. This is supported by a conversion rate of Inferred Mineral Resource to Mineral Reserves which has averaged more than 90% since the acquisition of Island Gold in 2017.

Magino open pit
Magino’s Mineral Reserves increased 56% to 3.1 million ounces, with the average grade declining slightly to 0.86 g/t Au. The main driver of the increase was the successful conversion of Mineral Resources to Mineral Reserves. A small portion of the increase was attributable to the higher gold price assumption of $1,800 per ounce.

Measured and Indicated Mineral Resources decreased 24% to 1.4 million ounces with the average grade declining 17% to 0.79 g/t Au. Inferred Mineral Resources decreased 71% to 338,000 ounces with the average grade declining 18% to 0.75 g/t Au. The decline in Mineral Resources reflects the successful conversion to Mineral Reserves.

Island Gold District Expansion – significant exploration upside
On February 3, 2026, the results of the Island Gold District Expansion Study (“IGD Expansion”) were announced. The study incorporated the significant growth in underground and open pit Mineral Reserves defined within the Island Gold District over the past year, supporting an expansion of the operation to 20,000 tonnes per day (“tpd”). The expansion is expected to create one of the largest, longest life, and most profitable gold operations in Canada. Following the completion of the expansion in 2028, average annual production is expected to increase to 534,000 ounces over the first 10 years at mine-site all-in sustaining costs (“AISC”) of $1,025 per ounce.

Given ongoing exploration success and with significant exploration potential across the Island Gold District, there are excellent opportunities for further growth and upside. This includes within the main Island Gold deposit, which remains open laterally and at depth, as well as within multiple higher-grade regional targets in proximity to the Magino mill. The North Shear and past producing Cline-Pick mines represent opportunities for further production upside as potential sources of additional higher-grade mill feed within the expanded mill. Each will be an exploration focus in 2026.

A total of $43 million is budgeted for exploration at the Island Gold District in 2026, up from $24 million spent in 2025. The exploration program will continue to build on the success from 2025 with high-grade gold mineralization extended across the Island Gold deposit, as well as within multiple structures within the hanging wall and footwall.

The 2026 budget includes 50,000 metres ("m") of underground exploration drilling focused on defining new Mineral Reserves and Mineral Resources in proximity to existing production horizons and infrastructure. This includes drilling across the strike extent of the main Island Gold deposit (E1E and C-Zones), as well as within a growing number of newly defined hanging wall and footwall zones. To support the underground exploration program, 1,090 m of underground exploration drift development is planned to extend drill platforms on multiple levels.

Additionally, 48,000 m of surface exploration drilling has been budgeted targeting the area between the Island Gold and Magino deposits, as well as the down-plunge extension of the Island Gold deposit, below a depth of 1,500 m.

Included within sustaining capital at Island Gold is 27,000 m of underground delineation drilling. The focus of the delineation drilling at Island Gold is the ongoing conversion of Mineral Resources to Mineral Reserves.

The regional exploration program at the Island Gold District includes 16,000 m of surface drilling. The focus of the regional program will be following up on high-grade mineralization intersected in the 2025 drill program at Cline-Pick, located approximately seven kilometres (“km”) northeast of the Island Gold mine. Drilling will also be completed at the historic Edwards Mine, located in proximity to the Cline-Pick mines with the objective of extending mineralization beyond historically mined areas. Drilling will also be undertaken at the Island Gold North Shear target, and to the east and along strike from the Island Gold mine to test the extension of the E1E-zone.

Young-Davidson
Mineral Reserves at Young-Davidson decreased 47,000 ounces to 3.0 million ounces at slightly lower grades of 2.20 g/t Au, with Mineral Reserve additions offsetting the majority of mining depletion over the past year.

Measured and Indicated Mineral Resources increased 26% to 1.5 million ounces, with the average grade increasing 10% to 3.15 g/t Au primarily reflecting growth within multiple hanging wall zones. Inferred Mineral Resources are largely unchanged at 0.2 million ounces grading 3.67 g/t Au.

A total of $17 million has been budgeted for exploration at Young-Davidson in 2026, up from $13 million spent in 2025. This includes 48,000 m of underground exploration drilling focused on two primary areas. The first is to continue to extend mineralization within the Young-Davidson syenite, which hosts the majority of Mineral Reserves and Mineral Resources.

The second is to test and expand on higher grade gold mineralization that has been intersected within two areas of focus in the hanging wall of the deposit as outlined in a press release issued on January 30, 2026. This new style of higher-grade mineralization is located in close proximity to the existing mid-mine infrastructure, with grades intersected well above the current Mineral Reserve grade.

To support the underground exploration program, 200 m of underground exploration development is planned which includes further extension of the 9620-level hanging wall exploration drift that was completed in 2025. The regional program includes 10,000 m of drilling focused on evaluating several targets including the Otisse NE and Biralger targets, located approximately 3 km and 17 km northeast of Young-Davidson, respectively.

Based on underground mining rates of 8,000 tonnes per day, the Mineral Reserve life of the Young-Davidson mine remains at 14 years as of December 31, 2025. Young-Davidson has sustained at least a 13‑year Mineral Reserve life since 2011, reflecting a strong track record of Mineral Resource conversion. With the deposit open at depth and to the west, and new hanging‑wall zones continuing to be defined, there is excellent potential for this track record to continue.

Mulatos District
Total Mulatos District Mineral Reserves decreased 14% (188,000 oz) to 1.2 million ounces reflecting depletion at La Yaqui Grande. Grades increased 27% to 4.0 g/t Au, with higher-grade Mineral Reserves at PDA representing a larger portion of total Mineral Reserves.

Mineral Reserves at PDA were not updated from a year ago (1.1 million ounces grading 5.45 g/t Au) as limited exploration drilling was completed with the focus shifting to development of the project. Exploration and Mineral Resource expansion drilling will recommence at PDA once underground drill platforms have been established to allow for more efficient exploration drill testing below unmineralized cover rock. With the deposit open in multiple directions, there is excellent potential for PDA to continue to grow. Based on current Mineral Reserves, PDA has a nine year mine life with significant exploration upside potential.

A bigger focus of the exploration program in 2025 was on extending and defining higher-grade sulphide mineralization as sources of additional mill feed for the PDA project. The program was successful in defining additional Mineral Resources at Cerro Pelon and a new discovery at Halcon.

Total Measured and Indicated Mineral Resources increased 26% to 0.8 million ounces, with grades decreasing 4% to 1.54 g/t Au. The majority of the increase was attributable to Cerro Pelon, which nearly doubled in size to contain 192,000 ounces grading 4.28 g/t Au. Inferred Mineral Resources also increased 20,000 ounces to 101,000 ounces grading 1.18 g/t Au.

The PDA project will include the construction of a 2,000 tpd mill to process higher-grade sulphide ore from PDA, opening up new opportunities to define and incorporate additional sulphide ore from across the District. PDA remains on track for initial production mid-2027. Cerro Pelon, Halcon and other targets across the District, including La Yaqui Grande, represent upside to the PDA project as potential sources of additional higher-grade sulphide ore.

A total of $21 million is budgeted at Mulatos for exploration in 2026, consistent with the $20 million spent in 2025. The regional drilling program is expected to total 44,500 m and includes 20,000 m of surface exploration drilling at the Cerro Pelon sulphide target, 9,000 m at the Halcon target (discovered in 2025), and an additional 15,500 m planned across several early to advanced staged targets within the Mulatos District.

Lynn Lake District
Total Mineral Reserves for the Lynn Lake District increased 3% to 3.4 million ounces, with grades decreasing slightly to 1.25 g/t Au. The driver of this growth was Mineral Reserve additions within the Linkwood deposit, one of four deposits that comprise the Lynn Lake Project.

Measured and Indicated Mineral Resources increased by 0.3 million ounces to 0.9 million ounces, reflecting growth across all four deposits. Inferred Mineral Resources increased by 0.1 million ounces to 0.3 million ounces.

A total of $6 million has been budgeted for exploration at the Lynn Lake project in 2026. This is up from $3 million spent in 2025. The exploration budget includes 13,500 m to test the potential for underground mining opportunities below the Gordon and MacLellan open pits.

Qualified Persons
Chris Bostwick, FAusIMM, Alamos Gold’s Senior Vice President, Technical Services, has reviewed and approved the scientific and technical information contained in this news release. Chris Bostwick is a Qualified Person within the meaning of Canadian Securities Administrator’s National Instrument 43-101 (“NI 43-101”). The Qualified Persons for the National Instrument 43-101 compliant Mineral Reserve and Resource estimates are detailed in the following table.

Mineral Resources QP		Company		Project
Jeffrey Volk, CPG, FAusIMM		Director - Reserves and Resources, Alamos Gold Inc.		Young-Davidson, Lynn Lake, Golden Arrow, Magino
Tyler Poulin, P.Geo		Geology Superintendent - Island Gold, Alamos Gold Inc.		Island Gold
Marc Jutras, P.Eng		Principal, Ginto Consulting Inc.		Mulatos Pits, PDA, La Yaqui Grande, Cerro Pelon, Carricito
Mineral Reserves QP		Company		Project
Chris Bostwick, FAusIMM		SVP Technical Services, Alamos Gold Inc.		Young-Davidson, PDA
Francis McCann, P.Eng		Director – Technical Services, Alamos Gold Inc.		Magino, Lynn Lake
Nathan Bourgeault, P.Eng		Technical Services Superintendent - Island Gold, Alamos Gold Inc.		Island Gold
Herb Welhener, SME-QP		VP, Independent Mining Consultants Inc.		La Yaqui Grande

With the exception of Mr. Volk, Mr. Bostwick, Mr. McCann, Mr. Poulin, and Mr. Bourgeault, each of the foregoing individuals are independent of Alamos Gold.

About Alamos
Alamos is a Canadian-based intermediate gold producer with diversified production from three operations in North America. This includes the Island Gold District and Young-Davidson mine in northern Ontario, Canada, and the Mulatos District in Sonora State, Mexico. Additionally, the Company has a strong portfolio of growth projects including the IGD Expansion, and the Lynn Lake project in Manitoba, Canada. Alamos employs more than 2,400 people and is committed to the highest standards of sustainable development. The Company’s shares are traded on the TSX and NYSE under the symbol “AGI”.
FOR FURTHER INFORMATION, PLEASE CONTACT:

Scott K. Parsons
Senior Vice President, Corporate Development & Investor Relations
(416) 368-9932 x 5439
Khalid Elhaj
Vice President, Business Development & Investor Relations
(416) 368-9932 x 5427
ir@alamosgold.com

The TSX and NYSE have not reviewed and do not accept responsibility for the adequacy or accuracy of this release.

Cautionary Note regarding Forward-Looking Statements

This news release contains or incorporates by reference “forward-looking statements” and “forward-looking information” as defined under applicable Canadian and U.S. securities laws. All statements in this news release other than statements of historical fact, which address events, results, outcomes or developments that Alamos expects to occur are, or may be deemed to be, forward-looking statements. Forward-looking statements are generally, but not always, identified by the use of forward-looking terminology such as "expect", “anticipate”, assume”, "plan", “continue”, “ongoing”, “trend”, "estimate", “target”, “budget”, “prospective”, “opportunity”, or “potential” or variations of such words and phrases and similar expressions or statements that certain actions, events or results "may", "could", "would", "might" or "will" be taken, occur or be achieved or the negative connotation of such terms. Forward-looking statements contained in this news release are based on expectations, estimates and projections as at the date of this news release.

Forward-looking statements in this news release include, without limitation, information, expectations and guidance as to strategy, plans, future financial and operating performance, such as statements, expectations and guidance regarding: planned exploration programs, focuses, targets and budgets; exploration potential; potential drilling results and related expectations; expected underground mining rates; gold production, production rates and production potential, including expected increases in gold production from Island Gold over the longer term; sustaining capital, costs and expenditures (including mine-site AISC); project economics; value of operations; gold price assumptions; ongoing construction of the Phase 3+ Expansion Project at Island Gold; the Island Gold District Expansion; construction of the Lynn Lake Project; Construction of the Puerto Del Aire Project and timing of initial production; Mineral Resources at Cerro Pelon and the discovery at Halcon; potential for underground mining opportunities below the Gordon and MacLellan open pits at the Lynn Lake project; projected ore grades; Mineral Reserve and Resource growth; Mineral Resource conversion rates; mine life; Mineral Reserve life; and other information that is based on forecasts and projections of future operational, geological or financial results, estimates of amounts not yet determinable and assumptions of management.

Exploration results that include geophysics, sampling, and drill results on wide spacings may not be indicative of the occurrence of a mineral deposit. Such results do not provide assurance that further work will establish sufficient grade, continuity, metallurgical characteristics and economic potential to be classed as a category of Mineral Resource. A Mineral Resource that is classified as "Inferred" or "Indicated" has a great amount of uncertainty as to its existence and economic and legal feasibility. It cannot be assumed that any or part of an "Indicated Mineral Resource" or "Inferred Mineral Resource" will ever be upgraded to a higher category of Mineral Resource. Investors are cautioned not to assume that all or any part of mineral deposits in these categories will ever be converted into Proven and Probable Mineral Reserves.

Alamos cautions that forward-looking statements are necessarily based upon several factors and assumptions that, while considered reasonable by management at the time of making such statements, are inherently subject to significant business, economic, technical, legal, political and competitive uncertainties and contingencies. Known and unknown factors could cause actual results to differ materially from those projected in the forward-looking statements, and undue reliance should not be placed on such statements and information.

Such factors and assumptions include (without limitation): the actual results of current exploration activities; changes to current estimates of mineral reserves and mineral resources; conclusions of economic and geological evaluations; changes in project parameters as plans continue to be refined; operations may be exposed to illness, disease, epidemic or pandemic which may impact, among other things, the broader market; state and federal orders or mandates (including with respect to mining operations generally or auxiliary businesses or services required for the Company’s operations) in Canada, Mexico and other jurisdictions in which the Company does or may conduct business; the duration of regulatory responses to any illness, disease, epidemic or pandemic; changes in national and local government legislation, controls or regulations; failure to comply with environmental and health and safety laws and regulations; labour and contractor availability (and being able to secure the same on favourable terms); ability to sell or deliver gold doré bars; disruptions in the maintenance or provision of required infrastructure and information technology systems; fluctuations in the price of gold or certain other commodities such as, diesel fuel, natural gas, and electricity; operating or technical difficulties in connection with mining or development activities, including geotechnical challenges and changes to production estimates (which assume accuracy of projected ore grade, mining rates, recovery timing and recovery rate estimates and may be impacted by unscheduled maintenance); changes in foreign exchange rates (particularly the Canadian dollar, U.S. dollar, and Mexican peso); the impact of inflation; the potential impact of any tariffs, trade barriers and/or regulatory costs; employee and community relations; litigation and administrative proceedings; disruptions affecting operations; risks associated with the startup of new mines; availability of and increased costs associated with mining inputs and labour; delays in the development or updating of mine plans; delays in implementing improvement initiatives; delays in construction, including the Phase 3+ expansion project, the Island Gold District Expansion, the PDA project, and the Lynn Lake project; inherent risks and hazards associated with mining and mineral processing including industrial accidents; environmental hazards including, without limitation, fires, floods, seismic activity, unusual or unexpected formations, pressures and cave-ins; the risk that the Company’s mines may not perform as planned; uncertainty with the Company's ability to secure additional capital to execute its business plans; the speculative nature of mineral exploration and development, risks in obtaining and maintaining necessary licenses, permits and authorizations, contests over title to properties; expropriation or nationalization of property; political or economic developments in Canada or Mexico and other jurisdictions in which the Company does or may carry on business in the future; increased costs and risks related to the potential impact of climate change; the costs and timing of exploration, construction and development of new deposits; risk of loss due to sabotage, protests and other civil disturbances; the impact of global liquidity and credit availability and the values of assets and liabilities based on projected future cash flows; and business opportunities that may be pursued by the Company.

For a more detailed discussion of such risks and other factors that may affect the Company's ability to achieve the expectations set forth in the forward-looking statements contained in this news release, see the Company’s latest 40-F/Annual Information Form and Management’s Discussion and Analysis, each under the heading “Risk Factors”, available on the SEDAR+ website at www.sedarplus.ca or on EDGAR at www.sec.gov. The foregoing should be reviewed in conjunction with the information and risk factors and assumptions found in this news release.

The Company disclaims any intention or obligation to update or revise any forward-looking statements, whether written or oral, or whether as a result of new information, future events or otherwise, except as required by applicable law.

Note to U.S. Investors – Mineral Reserve and Resource Estimates

Unless otherwise indicated, all Mineral Resource and Mineral Reserve estimates included in this news release have been prepared in accordance with National Instrument 43-101 - Standards of Disclosure for Mineral Projects (“NI 43-101”) and the Canadian Institute of Mining, Metallurgy and Petroleum (the “CIM”) - CIM Definition Standards on Mineral Resources and Mineral Reserves, adopted by the CIM Council, as amended (the “CIM Standards”). NI 43-101 is a rule developed by the Canadian Securities Administrators, which established standards for all public disclosure an issuer makes of scientific and technical information concerning mineral projects. Mining disclosure in the United States was previously required to comply with SEC Industry Guide 7 (“SEC Industry Guide 7”) under the United States Securities Exchange Act of 1934, as amended. The U.S. Securities and Exchange Commission (the “SEC”) has adopted final rules, to replace SEC Industry Guide 7 with new mining disclosure rules under sub-part 1300 of Regulation S-K of the U.S. Securities Act (“Regulation S-K 1300”) which became mandatory for U.S. reporting companies beginning with the first fiscal year commencing on or after January 1, 2021. Under Regulation S-K 1300, the SEC now recognizes estimates of “Measured Mineral Resources”, “Indicated Mineral Resources” and “Inferred Mineral Resources”. In addition, the SEC has amended its definitions of “Proven Mineral Reserves” and “Probable Mineral Reserves” to be substantially similar to international standards.

Investors are cautioned that while the above terms are “substantially similar” to CIM Definitions, there are differences in the definitions under Regulation S-K 1300 and the CIM Standards. Accordingly, there is no assurance any Mineral Reserves or Mineral Resources that the Company may report as “Proven Mineral Reserves”, “Probable Mineral Reserves”, “Measured Mineral Resources”, “Indicated Mineral Resources” and “Inferred Mineral Resources” under NI 43-101 would be the same had the Company prepared the Mineral Reserve or mineral resource estimates under the standards adopted under Regulation S-K 1300. U.S. investors are also cautioned that while the SEC recognizes “Measured Mineral Resources”, “Indicated Mineral Resources” and “Inferred Mineral Resources” under Regulation S-K 1300, investors should not assume that any part or all of the mineralization in these categories will ever be converted into a higher category of Mineral Resources or into Mineral Reserves. Mineralization described using these terms has a greater degree of uncertainty as to its existence and feasibility than mineralization that has been characterized as Reserves. Accordingly, investors are cautioned not to assume that any Measured Mineral Resources, Indicated Mineral Resources, or Inferred Mineral Resources that the Company reports are or will be economically or legally mineable.

Cautionary non-GAAP Measures and Additional GAAP Measures

Note that for purposes of this section, GAAP refers to IFRS. The Company believes that investors use certain non-GAAP and additional GAAP measures as indicators to assess gold mining companies. They are intended to provide additional information and should not be considered in isolation or as a substitute for measures of performance prepared with GAAP. “Sustaining capital” are expenditures that do not increase annual gold ounce production at a mine site and excludes all expenditures at the Company’s development projects. “Total cash costs per ounce”, “all-in sustaining costs per ounce”, “mine-site all-in sustaining costs”, and “all-in costs per ounce” as used in this analysis are non-GAAP terms typically used by gold mining companies to assess the level of gross margin available to the Company by subtracting these costs from the unit price realized during the period. These non-GAAP terms are also used to assess the ability of a mining company to generate cash flow from operations. There may be some variation in the method of computation of these metrics as determined by the Company compared with other mining companies. In this context, “total cash costs” reflects mining and processing costs allocated from in-process and doré inventory and associated royalties with ounces of gold sold in the period. Total cash costs per ounce are exclusive of exploration costs. “All-in sustaining costs per ounce” include total cash costs, exploration, corporate and administrative, share based compensation and sustaining capital costs. “Mine-site all-in sustaining costs” include total cash costs, exploration, and sustaining capital costs for the mine-site, but exclude an allocation of corporate and administrative and share based compensation.

Additional GAAP measures that are presented on the face of the Company’s consolidated statements of comprehensive income and are not meant to be a substitute for other subtotals or totals presented in accordance with IFRS but rather should be evaluated in conjunction with such IFRS measures. This includes “Earnings from operations”, which is intended to provide an indication of the Company’s operating performance and represents the amount of earnings before net finance income/expense, foreign exchange gain/loss, other income/loss, and income tax expense. Non-GAAP and additional GAAP measures do not have a standardized meaning prescribed under IFRS and therefore may not be comparable to similar measures presented by other companies. A reconciliation of historical non-GAAP and additional GAAP measures are detailed in the Company’s Management’s Discussion and Analysis available at www.alamosgold.com.

Table 1: Total Proven and Probable Mineral Reserves as of December 31, 2025

PROVEN AND PROBABLE GOLD RESERVES (as at December 31, 2025)
	Proven Reserves			Probable Reserves			Total Proven and Probable
	Tonnes	Grade	Ounces	Tonnes	Grade	Ounces	Tonnes	Grade	Ounces
	(000's)	(g/t Au)	(000's)	(000's)	(g/t Au)	(000's)	(000's)	(g/t Au)	(000's)
Island Gold	1,123	11.50	415	13,949	10.54	4,726	15,072	10.61	5,141
Magino	42,437	0.80	1,097	70,704	0.90	2,044	113,141	0.86	3,141
Total Island Gold District	43,559	1.08	1,512	84,653	2.49	6,769	128,212	2.01	8,282
Young-Davidson	12,457	2.18	873	29,727	2.21	2,109	42,184	2.20	2,983
La Yaqui Grande	127	0.90	4	3,166	1.37	139	3,293	1.35	143
Puerto Del Aire	946	4.78	145	5,104	5.57	914	6,050	5.45	1,060
Total Mulatos	1,073	4.32	149	8,270	3.96	1,054	9,343	4.00	1,203
MacLellan	16,840	1.64	886	24,318	1.08	846	41,158	1.31	1,732
Gordon	4,347	2.29	320	6,093	1.83	359	10,440	2.02	679
Burnt Timber	4,201	1.26	170	9,733	0.89	278	13,934	1.00	449
Linkwood	1,779	0.90	51	18,127	0.90	525	19,906	0.90	576
Total Lynn Lake	27,167	1.64	1,428	58,271	1.07	2,008	85,438	1.25	3,436
Alamos - Total	84,256	1.46	3,963	180,920	2.05	11,940	265,176	1.87	15,903

PROVEN AND PROBABLE SILVER MINERAL RESERVES (as at December 31, 2025)
	Proven Reserves			Probable Reserves			Total Proven and Probable
	Tonnes	Grade	Ounces	Tonnes	Grade	Ounces	Tonnes	Grade	Ounces
	(000's)	(g/t Ag)	(000's)	(000's)	(g/t Ag)	(000's)	(000's)	(g/t Ag)	(000's)
La Yaqui Grande	-	-	-	3,166	14.77	1,503	3,166	14.77	1,503
Puerto Del Aire	946	13.31	405	5,104	6.60	1,083	6,050	7.65	1,487
MacLellan	16,840	5.25	2,840	24,318	3.48	2,719	41,158	4.20	5,559
Alamos - Total	17,786	5.67	3,245	32,587	5.06	5,304	50,373	5.28	8,549

.

Table 2: Project Life-of-Mine Mineral Reserve Waste-to-Ore Ratios as of December 31, 2025
Project	Waste-to-Ore Ratio
Magino	3.6
La Yaqui Grande Pit	5.2
Lynn Lake Pits	4.8

Table 3: Total Measured and Indicated Mineral Resources as of December 31, 2025
MEASURED AND INDICATED GOLD MINERAL RESOURCES (as at December 31, 2025)
	Measured Resources			Indicated Resources			Total Measured and Indicated
	Tonnes	Grade	Ounces	Tonnes	Grade	Ounces	Tonnes	Grade	Ounces
	(000's)	(g/t Au)	(000's)	(000's)	(g/t Au)	(000's)	(000's)	(g/t Au)	(000's)
Island Gold	329	11.19	118	1,764	8.32	472	2,093	8.77	590
Magino	6,714	0.70	151	50,084	0.80	1,288	56,798	0.79	1,439
Total Island Gold District	7,042	1.19	270	51,848	1.06	1,760	58,891	1.07	2,029
Young-Davidson - Surface	496	1.13	18	1,242	1.28	51	1,739	1.24	69
Young-Davidson - Underground	5,417	2.65	461	7,553	3.95	959	12,970	3.40	1,420
Total Young-Davidson	5,913	2.52	479	8,795	3.57	1,010	14,708	3.15	1,489
Golden Arrow	3,626	1.26	147	2,816	1.09	99	6,442	1.19	246
Mulatos	864	0.97	27	7,326	0.96	225	8,190	0.96	252
La Yaqui Grande	-	-	-	1,462	0.80	38	1,462	0.81	38
Puerto Del Aire	364	3.32	39	2,039	3.52	230	2,403	3.49	269
Cerro Pelon	238	4.91	38	1,153	0.00	154	1,391	4.28	192
Carricito	-	-	-	3,356	0.75	80	3,356	0.74	80
Total Mulatos	1,466	2.20	103	15,336	1.48	727	16,802	1.54	831
MacLellan	892	2.87	82	7,331	1.43	337	8,223	1.59	419
Gordon	104	5.55	19	1,148	2.36	87	1,252	2.63	106
Burnt Timber	531	1.62	28	6,497	0.87	181	7,028	0.92	208
Linkwood	208	1.00	7	5,024	0.90	145	5,232	0.90	152
Total Lynn Lake	1,735	2.42	135	20,000	1.17	750	21,735	1.27	885
Alamos - Total	19,782	1.78	1,135	98,795	1.37	4,346	118,578	1.44	5,480

MEASURED AND INDICATED SILVER MINERAL RESOURCES (as at December 31, 2025)
	Measured Resources			Indicated Resources			Total Measured and Indicated
	Tonnes	Grade	Ounces	Tonnes	Grade	Ounces	Tonnes	Grade	Ounces
	(000's)	(g/t Ag)	(000's)	(000's)	(g/t Ag)	(000's)	(000's)	(g/t Ag)	(000's)
La Yaqui Grande	-	-	-	1,462	9.93	467	1,462	9.93	467
Puerto Del Aire	364	14.69	172	2,039	9.16	601	2,403	10.00	772
Cerro Pelon	238	75.25	577	1,153	43.93	1,628	1,391	49.29	2,205
Carricito	-	-	-	3,356	0.61	66	3,356	0.61	66
MacLellan	892	10.53	302	7,331	4.00	942	8,223	4.71	1,244
Alamos - Total	1,494	21.87	1,050	15,340	7.51	3,704	16,834	8.78	4,754

Table 4: Total Inferred Mineral Resources as of December 31, 2025
INFERRED GOLD MINERAL RESOURCES (as at December 31, 2025)
	Tonnes	Grade	Ounces
	(000's)	(g/t Au)	(000's)
Island Gold	2,867	11.51	1,061
Magino	14,045	0.75	338
Total Island Gold District	16,912	2.57	1,398
Young-Davidson - Surface	31	0.99	1
Young-Davidson - Underground	1,382	3.73	166
Total Young-Davidson	1,413	3.67	167
Golden Arrow	2,028	1.07	70
Mulatos	761	0.91	22
La Yaqui Grande	41	2.17	3
Puerto Del Aire	281	4.07	37
Cerro Pelon	83	3.99	11
Carricito	1,499	0.60	29
Total Mulatos	2,665	1.18	101
MacLellan	9,085	0.77	225
Gordon	222	1.23	9
Burnt Timber	1,379	0.81	36
Linkwood	1,253	0.93	37
Total Lynn Lake	11,939	0.80	308
Alamos - Total	34,958	1.82	2,044

INFERRED SILVER MINERAL RESOURCES (as at December 31, 2025)
	Tonnes	Grade	Ounces
	(000's)	(g/t Ag)	(000's)
La Yaqui Grande	41	3.69	5
Puerto Del Aire	281	11.30	102
Cerro Pelon	83	20.86	55
Carricito	1,499	0.53	26
MacLellan	9,085	1.60	466
Alamos - Total	10,989	1.85	655

Notes to Mineral Reserve and Resource Tables:

• The Company’s Mineral Reserves and Mineral Resources as at December 31, 2025 are classified in accordance with the Canadian Institute of Mining Metallurgy and Petroleum’s “CIM Standards on Mineral Resources and Reserves, Definition and Guidelines” as per Canadian Securities Administrator’s NI 43-101 requirements.
• Mineral Resources are not Mineral Reserves and do not have demonstrated economic viability.
• Mineral Resources are exclusive of Mineral Reserves.
• Mineral Reserve cut-off grade for the La Yaqui Pit is determined as a net of process value of $0.10 per tonne for each model block.
• All Measured, Indicated and Inferred open pit Mineral Resources are pit constrained.
• With the exceptions noted below, Mineral Reserve estimates assumed a gold price of $1,800 per ounce and Mineral Resource estimates assumed a gold price of $2,000 per ounce.
• Metal prices, cut-off grades and metallurgical recoveries are set out in the table below.
  
  

	Mineral Resources		Mineral Reserves
	Gold Price	Cut-off	Gold Price	Cut-off	Met Recovery
Island Gold	$2,000	3.75	$1,800	3.78	97%
Magino	$2,000	0.28	$1,800	0.30	90-93%
Young-Davidson - Surface	$1,400	0.5	n/a	n/a	n/a
Young-Davidson - Underground	$2,000	1.39	$1,800	1.57	92%
Golden Arrow	$1,600	0.64	n/a	n/a	91%
Mulatos:
Mulatos Main Open Pit	$2,000	0.5	n/a	n/a	n/a
PDA Underground	$1,800	2.5	$1,600	3.0	85%
La Yaqui Grande	$2,000	0.3	$1,800	see notes	75%
Cerro Pelon	$2,000	2.5	n/a	n/a	n/a
Carricito	$2,000	0.3	n/a	n/a	n/a
Lynn Lake - MacLellan	$2,000	0.30	$1,800	0.33	91-92%
Lynn Lake - Gordon	$2,000	0.41	$1,800	0.45	92.4%
Lynn Lake - Burnt Timber	$2,000	0.36	$1,800	0.40	91-92%
Lynn Lake - Linkwood	$2,000	0.36	$1,800	0.40	91-92%

Figure 1: Island Gold Mine Main Structure (C/E1E Zone) & Magino Longitudinal – 2025 Mineral Reserves & Resources 

Figure 2: Island Gold Mine Main Structure (C/E1E Zone) Longitudinal – Higher-Grade Mineral Reserves in Island East Driving Growth

Figures accompanying this announcement are available at:

https://www.globenewswire.com/NewsRoom/AttachmentNg/4a6acba7-929f-4d3a-8d4a-687bddad2f58

https://www.globenewswire.com/NewsRoom/AttachmentNg/fb3386e2-50a0-4760-a417-302a776a8d8a

https://www.globenewswire.com/NewsRoom/AttachmentNg/b2651154-7227-4bce-afc7-380909c544f4

https://www.globenewswire.com/NewsRoom/AttachmentNg/73734493-4a89-4754-b342-7184ec3ee0cd

https://www.globenewswire.com/NewsRoom/AttachmentNg/a2c2dbd0-d8a4-4c46-b0b9-6a4e0916076d

FAQ

How much did Alamos Gold (AGI) increase its Proven and Probable Mineral Reserves in 2025?

Alamos increased Proven and Probable Mineral Reserves by 32% to 15.9 million ounces. According to the company, the rise was driven mainly by conversion of resources at Island Gold and Magino and outpaced 2025 mining depletion of 594,000 ounces.

What changed at Island Gold in Alamos Gold's 2025 reserves update (AGI)?

Island Gold Mineral Reserves more than doubled, increasing 125% to 5.1 million ounces at 10.61 g/t. According to the company, conversion of lower Island East resources and high-grade hanging wall/footwall zones drove the growth, net of 166,000 ounces depletion.

What is Alamos Gold's (AGI) 2026 exploration budget and focus areas?

Alamos budgeted a record $97 million for exploration in 2026, a 37% increase year-over-year. According to the company, programs expand at Island Gold, Young-Davidson and Lynn Lake with 50,000 m underground and 48,000 m surface drilling at Island Gold.

What are the planned production and cost targets from the Island Gold District expansion for AGI?

The Island Gold expansion targets 20,000 tpd with average annual production of 534,000 ounces over the first 10 years. According to the company, the plan projects mine-site AISC of $1,025 per ounce after completion in 2028.

How did Alamos Gold's (AGI) Inferred Mineral Resources change in 2025 and why?

Inferred Mineral Resources decreased 63% to 2.0 million ounces in 2025. According to the company, the decline largely reflects successful conversion of higher-grade inferred resources at Island Gold and Magino into Mineral Reserves.

Did any Alamos Gold (AGI) assets see reduced Mineral Reserves in 2025?

Yes; Mulatos Mineral Reserves decreased to 1.2 million ounces (14% decline), primarily due to depletion at La Yaqui Grande. According to the company, limited drilling at Puerto Del Aire left higher-grade underground reserves unchanged.